Chin cup



FIG. 1 is a perspective view of a chin cup showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof; and,

FIG. 4 is a side view thereof, the opposite side being a mirror image.

The chin cup and straps shown in broken lines in FIGS. 1-4, form no part of the claimed design. The chin cup shown in broken lines in FIGS. 1, 2 and 4 has been removed in FIG. 3 in order to show the inside of the chin cup. 

The ornamental design for a chin cup, as shown and described. 